"I believe DW had a difficult time selling every Peart R30 kit (I believe 30 sets) , but that was huge and very expensive (wasn't it $30,000?). The smaller kits (Ringo, Watts, etc) would probably go...

The mini lugs were briefly offered as an option but they have no swivel nuts... the lugs themselves are threaded for the tension rods and people were cross-threading the lugs when they changed heads....